Set top box



FIG. 1 is a front right perspective view of the set top box showing our new design;

FIG. 2 is a front view thereof

FIG. 3 is a rear view thereof:

FIG. 4 is a top view thereof;

FIG. 5 is bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for a set top box, as shown and described. 